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They had told me they don’t sell the current doubler.
Here’s another email I just got from them:

Victoria Godfrey (Strymon)

Jan 2, 2023, 15:53 AKST

Hi Phil,

Attached is a screenshot from Eventide’s website stating that the H90 is positive polarity.

We do not sell current doublers, as previously mentioned. You could use this current doubler:


Which would connect to the DC power cables that come with Zuma, which then would connect to our red-tipped polarity reversal cable:

Which would then connect into the H90.

I hope this clears it up for you.